CN117053611B - Plate of plate heat exchanger and preparation, cleaning and application methods thereof - Google Patents
Plate of plate heat exchanger and preparation, cleaning and application methods thereof Download PDFInfo
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- CN117053611B CN117053611B CN202311314603.4A CN202311314603A CN117053611B CN 117053611 B CN117053611 B CN 117053611B CN 202311314603 A CN202311314603 A CN 202311314603A CN 117053611 B CN117053611 B CN 117053611B
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- nickel
- protective coating
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- 238000000034 method Methods 0.000 title claims abstract description 67
- 238000004140 cleaning Methods 0.000 title claims abstract description 19
- 238000002360 preparation method Methods 0.000 title abstract description 14
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 67
- 238000000576 coating method Methods 0.000 claims abstract description 63
- 239000011253 protective coating Substances 0.000 claims abstract description 61
- 239000011248 coating agent Substances 0.000 claims abstract description 60
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 claims abstract description 50
- 239000000463 material Substances 0.000 claims abstract description 33
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 33
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000010936 titanium Substances 0.000 claims abstract description 30
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 30
- 238000005868 electrolysis reaction Methods 0.000 claims abstract description 23
- 238000009713 electroplating Methods 0.000 claims description 52
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 45
- 230000008569 process Effects 0.000 claims description 43
- 239000010410 layer Substances 0.000 claims description 41
- 238000007747 plating Methods 0.000 claims description 39
- 239000000126 substance Substances 0.000 claims description 31
- 239000003792 electrolyte Substances 0.000 claims description 23
- 229910052742 iron Inorganic materials 0.000 claims description 23
- 239000000758 substrate Substances 0.000 claims description 16
- 239000002351 wastewater Substances 0.000 claims description 16
- 229910052751 metal Inorganic materials 0.000 claims description 11
- 239000002184 metal Substances 0.000 claims description 11
- 238000003466 welding Methods 0.000 claims description 9
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims description 7
- VEQPNABPJHWNSG-UHFFFAOYSA-N Nickel(2+) Chemical compound [Ni+2] VEQPNABPJHWNSG-UHFFFAOYSA-N 0.000 claims description 7
- 229910001448 ferrous ion Inorganic materials 0.000 claims description 7
- 229910001453 nickel ion Inorganic materials 0.000 claims description 7
- 238000004090 dissolution Methods 0.000 claims description 6
- 239000012466 permeate Substances 0.000 claims description 6
- 238000004065 wastewater treatment Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 3
- 230000002265 prevention Effects 0.000 claims description 3
- 239000003381 stabilizer Substances 0.000 claims description 3
- FZUJWWOKDIGOKH-UHFFFAOYSA-N sulfuric acid hydrochloride Chemical compound Cl.OS(O)(=O)=O FZUJWWOKDIGOKH-UHFFFAOYSA-N 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 2
- 230000007797 corrosion Effects 0.000 abstract description 13
- 238000005260 corrosion Methods 0.000 abstract description 13
- 239000000872 buffer Substances 0.000 abstract description 2
- 229910021645 metal ion Inorganic materials 0.000 description 9
- UGKDIUIOSMUOAW-UHFFFAOYSA-N iron nickel Chemical compound [Fe].[Ni] UGKDIUIOSMUOAW-UHFFFAOYSA-N 0.000 description 7
- 238000001704 evaporation Methods 0.000 description 6
- 230000008020 evaporation Effects 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000002131 composite material Substances 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- 230000002035 prolonged effect Effects 0.000 description 5
- 230000001681 protective effect Effects 0.000 description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 4
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- -1 fluoride ions Chemical class 0.000 description 4
- 238000002791 soaking Methods 0.000 description 4
- 229910021586 Nickel(II) chloride Inorganic materials 0.000 description 3
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 3
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 3
- 239000004327 boric acid Substances 0.000 description 3
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000011790 ferrous sulphate Substances 0.000 description 3
- 235000003891 ferrous sulphate Nutrition 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 3
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 3
- QMMRZOWCJAIUJA-UHFFFAOYSA-L nickel dichloride Chemical compound Cl[Ni]Cl QMMRZOWCJAIUJA-UHFFFAOYSA-L 0.000 description 3
- LGQLOGILCSXPEA-UHFFFAOYSA-L nickel sulfate Chemical compound [Ni+2].[O-]S([O-])(=O)=O LGQLOGILCSXPEA-UHFFFAOYSA-L 0.000 description 3
- 229910000363 nickel(II) sulfate Inorganic materials 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 239000001509 sodium citrate Substances 0.000 description 3
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 description 3
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 241000282414 Homo sapiens Species 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 239000006172 buffering agent Substances 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- 239000001506 calcium phosphate Substances 0.000 description 2
- 229910000389 calcium phosphate Inorganic materials 0.000 description 2
- 235000011010 calcium phosphates Nutrition 0.000 description 2
- 239000012459 cleaning agent Substances 0.000 description 2
- 239000008139 complexing agent Substances 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 2
- 239000000347 magnesium hydroxide Substances 0.000 description 2
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000008399 tap water Substances 0.000 description 2
- 235000020679 tap water Nutrition 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 2
- 239000000080 wetting agent Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000010840 domestic wastewater Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- LNOPIUAQISRISI-UHFFFAOYSA-N n'-hydroxy-2-propan-2-ylsulfonylethanimidamide Chemical compound CC(C)S(=O)(=O)CC(N)=NO LNOPIUAQISRISI-UHFFFAOYSA-N 0.000 description 1
- 235000006408 oxalic acid Nutrition 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/12—Electroplating: Baths therefor from solutions of nickel or cobalt
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/042—Prevention of deposits
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/043—Details
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D21/00—Processes for servicing or operating cells for electrolytic coating
- C25D21/12—Process control or regulation
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/56—Electroplating: Baths therefor from solutions of alloys
- C25D3/562—Electroplating: Baths therefor from solutions of alloys containing more than 50% by weight of iron or nickel or cobalt
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D7/00—Electroplating characterised by the article coated
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
- F28F19/02—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings
- F28F19/06—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings of metal
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Electroplating Methods And Accessories (AREA)
Abstract
The invention relates to a plate type heat exchanger plate, which comprises a heat exchanger plate base material (titanium material) and a protective coating, wherein the heat exchanger plate comprises a plate body and an electrode connecting part which is arranged on the plate body and is used for being connected with a power electrode; the protective coating is electroplated on the surface of the plate body, and is a nickel-iron alloy coating or a pure nickel coating. The protective coating not only maintains the excellent heat conduction performance of the plate, but also improves the corrosion resistance of the plate, and can be used as a buffer layer capable of being completely removed to isolate the contact between the plate and the scaling matters difficult to clean so as to achieve the purpose of thoroughly removing the scaling by electrolysis. The invention also provides a preparation and cleaning method of the plate heat exchanger plate, a heat exchanger and an application method thereof.
Description
Technical Field
The invention relates to the technical field of heat transfer, in particular to a nickel-iron plated plate heat exchanger plate, a preparation method and a cleaning method thereof and application of the plate heat exchanger formed by the plate.
Background
In recent years, the discharge amount of domestic wastewater and industrial wastewater is continuously increased, and the environmental protection is increasingly burdened, so that the living environment of human beings is threatened, and even the physical health of the human beings is affected. Therefore, in order to avoid the direct discharge of waste water from damaging the environment, the waste water must meet the acceptable discharge standard to be discharged. There are many existing processes for treating wastewater, in which the wastewater is treated by evaporation concentration using equipment, which is a very effective method for treating wastewater. The equipment not only can reduce the operation cost by reducing the energy consumption, but also has the advantages of high heat exchange efficiency, convenient disassembly and the like of the plate heat exchanger used by the equipment, and is suitable for most of wastewater treatment.
Although the evaporation and concentration of wastewater by using equipment is a more environment-friendly and efficient solution. However, since the wastewater contains a large amount of scaling ions such as calcium, magnesium, iron, nickel, aluminum, zinc, etc., the scaling ions react with other components in the wastewater to generate indissoluble scaling substances in the concentration process, and the generation of scaling substances is aggravated by too much SS (solid suspended matter) and too much COD (chemical oxygen demand). The complex scaling substances can be firmly attached to the plate heat exchanger to influence the heat exchange efficiency, so that the evaporation capacity is reduced, and the full-flow treatment process of the wastewater is not facilitated.
Common scale forming substances of the plate heat exchanger are calcium carbonate, magnesium hydroxide, calcium phosphate, iron oxide, calcium sulfate, composite silicate scale and the like, wherein the scale forming substances of the calcium carbonate, the magnesium hydroxide, the calcium phosphate, the iron oxide and the like can be cleaned by an acidic cleaning agent such as sulfamic acid and the like, but the scale forming chemical properties of the calcium sulfate, the composite silicate and the like are stable and are more firmly adhered, and the scale forming substances are difficult to clean even if soaked by a plurality of cleaning agents or cleaned by a high-pressure water gun. In order to ensure that the heat exchanger equipment can normally evaporate and concentrate waste water, when the scale formation on the heat exchanger plate is thick enough to influence the use, the new heat exchanger plate can only be replaced, so that the heat exchanger plate becomes a consumable, the project cost is greatly increased, and the long-term development of enterprises is not facilitated.
Disclosure of Invention
Based on the above, the invention aims to provide a plate type heat exchanger plate which is convenient for thoroughly removing scaling substances, can be repeatedly used for a plurality of times and reduces the cost.
The invention is realized by the following detailed technical scheme:
the plate type heat exchanger plate comprises a heat exchanger plate substrate and a protective coating, wherein the heat exchanger plate substrate comprises a plate body and an electrode connecting part which is arranged on the plate body and is used for being connected with a power electrode; the protective coating is electroplated on the surface of the plate body, and is a nickel-iron alloy coating or a pure nickel coating.
Compared with the prior art, the plate type heat exchanger plate provided by the invention has the advantages that one layer of protective coating is added to the plate type heat exchanger plate through an electroplating process, on one hand, the nickel-iron alloy coating or the pure nickel coating enables the plate type heat exchanger plate to effectively resist fluoride ions with higher concentration, the protective coating can avoid the risk that the plate type heat exchanger plate is corroded by the fluoride ions, on the other hand, the protective coating can replace the original plate type heat exchanger plate to be contacted with metal ions in wastewater, scaling matters can be attached to the protective coating, and scaling matters attached to the protective coating can be removed while the protective coating is dissolved through electrolytic reaction, so that the plate type heat exchanger is much easier than the conventional titanium plate. In addition, the heat exchanger plate can realize repeated use of the heat exchanger plate through the cyclic operation of electrolysis and electroplating of the protective coating, so that the service life of the heat exchanger plate is prolonged, and the cost is reduced.
Further, the electrode connecting portion and the plate body are integrally formed. The electrode connecting part and the plate body are integrally formed, so that the conductivity of the heat exchanger plate is better, and a coating film generated in the electroplating process is more uniform and compact.
Further, the thickness of the nickel-iron alloy coating is 25-100 mu m. The nickel-iron alloy plating layer with the thickness range has good corrosion resistance, good heat conductivity and good wear resistance. Too thin a coating can be easily carried over by the attached foulants due to insufficient strength, while thicker coatings not only increase a lot of cost, but also reduce the toughness of the coating due to too thick coatings, so that the coating is easy to crack and damage.
Further, the mass ratio of the nickel material to the iron material of the nickel-iron alloy plating layer is (7-8): 1. When the iron content in the nickel-iron alloy coating is low, the hardness of the coating is low but the toughness is high. As the iron content in the coating increases, the hardness of the coating increases, but the toughness decreases. When the iron content in the coating is 10% -13%, the alloy has the best combination of toughness, corrosion resistance and economy, and the mass ratio of nickel material to iron material is (7-8): 1.
The invention also provides a preparation method of the plate heat exchanger, which comprises the following steps:
(1) Pressing the heat exchanger plate base material on a titanium plate by using an integral forming process or welding the electrode connecting part on the plate body to form the heat exchanger plate base material;
(2) Placing the heat exchanger plate substrate prepared in the step (1) into an electrolytic tank as a cathode, and placing a flow guide electrode into the electrolytic tank as an anode, wherein the flow guide electrode is made of nickel-iron alloy or pure nickel;
(3) Pouring an electroplating solution into a plating tank and enabling the electroplating solution to permeate through the plate body, wherein the electroplating solution is a sulfate-chloride mixed type electroplating solution containing a stabilizer, and the pH value of the electroplating solution is 3-4;
(4) And connecting the cathode and the anode with a power supply, and then electrifying, wherein a layer of protection coating is formed on the plate body.
Compared with the prior art, the preparation method can prepare the plate heat exchanger plate sheet capable of thoroughly removing the scaling matters, and equipment used by the preparation method can be purchased directly, is low in cost and is beneficial to expanding production. The nickel sulfate, the nickel chloride and the ferrous sulfate in the electroplating solution are used as main salts to provide metal ions, the boric acid is used as a buffering agent to adjust and control the pH value of the electroplating solution, and the sodium citrate is used as a complexing agent to form a complex with the metal ions, so that the stability of the metal ions in the electroplating solution and the quality of a coating are improved, and the sodium dodecyl benzene sulfonate is used as a wetting agent to increase the interfacial tension of the metal and the solution, so that the coating is better formed on the surface of a heat exchanger plate, and the composite additive can enable the coating to be smoother and denser and improve the performance of the coating.
The invention also provides a cleaning method of the plate heat exchanger, which comprises the following steps:
(1) Placing a used plate type heat exchanger plate as an anode into an electrolytic tank, attaching scaling substances on a protective coating on the surface of the plate, and placing a flow guiding electrode as a cathode into the electrolytic tank, wherein the flow guiding electrode is made of nickel-iron alloy or pure nickel;
(2) Pouring an electrolyte into the electrolytic cell and causing the electrolyte to permeate the plate body portion, the electrolyte including nickel ions and ferrous ions;
(3) The cathode and the anode are electrified after being connected with a power supply, the protective coating is dissolved into the electrolyte, the scaling matters fall into the electrolyte along with the dissolution of the protective coating, and the metal simple substance is precipitated on the flow guide electrode and is nickel or iron.
Compared with the prior art, the cleaning method does not need to spend a great deal of time and manpower on physical flushing or chemical soaking, skillfully utilizes an electrolysis process, can effectively remove scaling substances attached to the protective coating while electrolyzing the protective coating on the heat exchanger plate, and is simple and convenient to operate. The cleaning method has more thorough cleaning effect, can thoroughly remove all the scaling substances from the attachment points of the scaling substances, and cannot thoroughly remove the scaling substances in the prior art. In addition, the cleaning method can directly use equipment of the preparation method, and can realize electrolytic cleaning operation only by exchanging a cathode and an anode, thereby being very convenient.
The invention also provides an application method of the plate heat exchanger in the field of wastewater treatment, which comprises the following steps:
(1) A plate heat exchanger with titanium plates is taken, the titanium plates are taken as heat exchanger plate base materials, a layer of protection plating layer is electroplated on the surfaces of the heat exchanger plate base materials to form scale prevention plates, and the protection plating layer is a nickel-iron alloy plating layer or a pure nickel plating layer;
(2) Treating wastewater by using a plate heat exchanger with the scale preventing plate;
(3) When the scale forming substances are attached to the protective coating, the scale preventing plate is electrolyzed, the protective coating is dissolved in the electrolysis process, and the scale forming substances attached to the surface of the protective coating can fall along with the dissolution of the protective coating;
(4) Taking the anti-scaling plate sheet subjected to electrolysis in the step (3) as a new heat exchanger plate sheet base material, and electroplating a new protective coating layer on the surface of the anti-scaling plate sheet to form a new anti-scaling plate sheet;
(5) Repeating the steps (2) - (4).
Compared with the prior art, the application method has the advantages that the protective coating is electroplated on the conventional titanium plate, so that scaling matters generated in wastewater treatment are adhered to the protective coating, the protective coating and scaling matters adhered to the protective coating are removed through electrolytic cleaning, scaling matters on the plate are thoroughly cleaned, the cleaned heat exchange plate can be used continuously by electroplating the protective coating, the service life of the heat exchange plate is effectively prolonged through repeated use, and the cost is further reduced. In addition, the application method does not need to use other complex processes, and only needs to add or remove the electroplated layer on the heat exchange plate of the existing equipment, thereby being very convenient.
Further, the titanium sheet comprises a sheet body and an electrode connecting part arranged on the sheet body and used for being connected with a power electrode, and the titanium sheet is pressed through an integral forming process or is formed by welding the electrode connecting part on the sheet body through electric welding. The electrode connecting part can enable the titanium plate to be completely immersed into the plating solution during electroplating, so that the whole titanium plate is covered by the protective plating layer.
Further, in the electroplating process in the step (1), the heat exchanger plate substrate is used as a cathode, a flow guiding electrode is used as an anode, and the flow guiding electrode is made of nickel-iron alloy or pure nickel;
and (3) in the electrolysis process in the step (3), the scale preventing plate is used as an anode, and the diversion electrode after the step (1) is used as a cathode. The flow guide electrode can play a role in electroplating and electrolysis, and the metal single separated out from the surface of the flow guide electrode in the electrolysis process can be applied to the preparation of a protective coating in the electroplating process, namely, the metal component in the flow guide electrode has little loss in the repeated electroplating process, can be repeatedly used continuously, and remarkably reduces the cost.
For a better understanding and implementation, the present invention is described in detail below with reference to the drawings.
Drawings
FIG. 1 is a schematic view of a plate heat exchanger plate according to the present invention;
FIG. 2 is a schematic illustration of an electroplating process for the heat exchanger plate of FIG. 1;
FIG. 3 is a schematic illustration of a cleaning process for the heat exchanger plates of FIG. 1;
wherein: 1: heat exchanger plate, 11: plate body, 111: mounting holes, 12: electrode connection part, 2: and a diversion electrode.
Detailed Description
Example 1
Referring to fig. 1, a plate heat exchanger plate 1 of the present invention includes a heat exchanger plate substrate and a protective coating (not shown), the heat exchanger plate substrate includes a plate body 11 and electrode connection portions 12 disposed on the plate body and used for connecting with a power electrode, the plate body 11 is a titanium plate, the number of the electrode connection portions 12 is one or more, and when the number of the electrode connection portions 12 is plural, the electrode connection portions 12 are disposed on the same side of the plate body 11 at equal intervals.
In this embodiment, the electrode connection portion 12 and the plate body 11 may be integrally formed by an integral molding process, or the electrode connection portion 12 may be welded to the plate body 11 by welding.
In this embodiment, the plate body 11 is further provided with a plurality of mounting holes 111, which facilitate the mounting and dismounting of the plate.
The protective coating is a nickel-iron alloy or nickel metal coating, and the thickness of the protective coating is 25-100 mu m, preferably 50 mu m. The protective coating can be used as a firm protective layer, has good corrosion resistance and heat conductivity, and has good wear resistance. However, the pure nickel plating layer has higher price, and nickel-iron alloy is preferable as the plating layer, so that the nickel-iron alloy can keep the good corrosion resistance, heat conductivity, wear resistance and other properties of the pure nickel plating layer, and the cost is effectively reduced by replacing part of metallic nickel with cheap iron.
The invention firstly tests the heat conduction performance of a heat exchanger plate sheet (hereinafter referred to as an "antiscaling plate sheet") with a nickel iron coating, respectively carries out a plurality of groups of heat exchange experiments on an original titanium plate sheet heat exchanger and an antiscaling plate sheet heat exchanger, specifically carries out heat exchange by utilizing tap water at 100 ℃ and tap water at 30 ℃, compares the heat exchange performance of the two heat exchangers by comparing the heat exchange temperature difference of inlet water and outlet water, and takes the average value of the plurality of groups of experiments, and related data are shown in table 1:
table 1 heat exchange performance test results of scale control plate
The comparison of the two groups of data shows that the heat exchange temperature difference between the anti-scaling sheet and the common titanium sheet is not greatly changed, and the heat exchange performance of the heat exchanger sheet 1 is not greatly influenced by the protective coating, so that the anti-scaling sheet can be directly applied to evaporation concentration treatment of wastewater.
The invention also researches the corrosion resistance of nickel-iron alloy plating layers with different nickel-iron mixing ratios, and selects the heat exchanger plate 1 with 3 nickel-iron alloy plating layers with the nickel-iron mixing ratios of 4:1, 8:1, 12:1 and the like for carrying out a corrosiveness hanging experiment. Soaking the 3 plates in a simulated water sample to be detected, heating and soaking for one month, and observing the change of the 3 heat exchange plates. The simulated water sample to be tested has a ph=4 and a fluoride ion content of 200 mg/L, and the experimental results are shown in table 2:
TABLE 2 Corrosion resistance test results of Nickel-iron alloy coatings with different Nickel-iron mixing ratios
The acidic condition of normal working of the titanium plate limits the fluoride ion content below 20 mg/L.
It follows that the higher the iron content of the nickel-iron alloy coating, the poorer the corrosion resistance. The nickel-iron alloy coating with the nickel-iron mixing ratio of more than 8:1 can make up the problem that the titanium material is not resistant to fluoride ion corrosion as a base material, so that the fluoride ion corrosion resistance concentration of the heat exchanger plate 1 can be increased from 20 mg/L to 200 mg/L, and the corrosion resistance of the heat exchanger plate 1 is greatly improved.
Further research on the nickel-iron alloy coating shows that the hardness and toughness of the coating have a certain relation with the coating structure. When the iron content in the coating is low, the hardness of the coating is low but the toughness is high. As the iron content in the coating increases, the hardness of the coating increases, but the toughness decreases. When the iron content in the plating layer is 10% -13%, the hardness, toughness, corrosion resistance and economy of the alloy are comprehensively optimal, and the mass ratio of the nickel material to the iron material is (7-8): 1, and the cost of iron is lower, so that 8:1 is selected as the preferable mixing mass ratio of the nickel material and the iron material of the nickel-iron alloy.
The invention also researches the influence of the thickness of the protective coating, and the specific operation is as follows:
three small plates with the same area are trimmed on a common titanium plate, nickel-iron alloy plating layers with the thickness of 25 mu m, 50 mu m and 100 mu m are respectively plated on the three small plates, the small plates are respectively soaked in a solution with high scale concentration ion and kept heated, a plate hanging experiment is carried out in the heating process, the plate phenomenon is observed after one month, and the experimental results are shown in Table 3:
TABLE 3 hanging test results of nickel-iron alloy plated sheets of different thicknesses
It can be seen that when the nickel-iron alloy coating is too thin, the coating is carried over by the attached foulants, whereas when the nickel-iron alloy coating is 50 μm and 100 μm thick, the coating is stable and is not carried over by the attached foulants. In view of economy and practicality, a thickness of 50 μm is selected as the optimal thickness of the plating layer.
Example 2
Referring to fig. 2, the present invention further provides a method for manufacturing a plate 1 of a plate heat exchanger, which comprises the following steps:
(1) Pressing a heat exchanger plate base material with an electrode connecting part on a titanium plate by using an integral forming process or welding the electrode connecting part on the titanium plate;
(2) Placing the heat exchanger plate substrate prepared in the step (1) into an electrolytic tank as a cathode, and placing a flow guiding electrode 2 into the electrolytic tank as an anode, wherein the flow guiding electrode 2 is made of nickel-iron alloy or pure nickel;
(3) Pouring an electroplating solution into an electrolytic tank and enabling the electroplating solution to permeate through the plate body part of the plate substrate of the heat exchanger, wherein the electroplating solution is a sulfate-chloride mixed type electroplating solution containing a stabilizer.
Specifically, the electroplating solution comprises nickel sulfate, nickel chloride, ferrous sulfate, boric acid, sodium citrate, sodium dodecyl benzene sulfonate and a composite additive, wherein the pH value of the electroplating solution is 3-4; the nickel sulfate, the nickel chloride and the ferrous sulfate in the electroplating solution are used as main salts to provide metal ions, the boric acid is used as a buffering agent to adjust and control the pH value of the electroplating solution, and the sodium citrate is used as a complexing agent to form a complex with the metal ions, so that the stability of the metal ions in the electroplating solution and the quality of a coating are improved, the sodium dodecyl benzene sulfonate is used as a wetting agent to increase the interfacial tension of the metal and the solution, so that the coating is better formed on the surface of the plate substrate of the heat exchanger, and the composite additive can enable the coating to be smoother and denser and improve the performance of the coating.
(4) And after the cathode and the anode are connected with a power supply, electrifying to start electroplating, wherein electrons are lost from metal in the diversion electrode 2 to be changed into metal ions to be dissolved into the electroplating solution, the metal ions in the electroplating solution can obtain electrons to form a metal protection coating on the heat exchanger plate base material, and the protection coating is a nickel-iron alloy coating or a pure nickel coating.
Example 3
The invention also provides a plate heat exchanger using the heat exchanger plate 1 described in example 1, the other components being identical to a conventional plate heat exchanger using titanium plates.
When the heat transfer efficiency is seriously affected by the scaling matters formed on the plate sheets of the plate heat exchanger, the plate sheets in the plate heat exchanger can be disassembled, the disassembled plate sheets are electrolyzed, the protective plating layers on the plate sheets can be continuously dissolved into electrolyte, and the scaling matters attached to the protective plating layers can fall into the electrolyte together with the protective plating layers. After the electrolysis is completed, the plate is changed into the plate substrate of the heat exchanger because the protective coating disappears, a new plate can be prepared by electroplating a new protective coating on the plate substrate of the heat exchanger, and the new plate can be installed in the plate heat exchanger for use.
Example 4
Referring to fig. 3, the present invention further provides a method for cleaning a plate heat exchanger plate 1, where the plate heat exchanger plate 1 is the plate heat exchanger plate 1 described in embodiment 1, and the specific steps are as follows:
(1) Placing a used plate type heat exchanger plate 1 as an anode into an electrolytic tank, attaching scaling substances on a protective coating on the surface of the plate, and placing a flow guiding electrode 2 as a cathode into the electrolytic tank, wherein the flow guiding electrode 2 is made of nickel-iron alloy or pure nickel;
(2) Pouring an electrolyte into the electrolytic cell and causing the electrolyte to permeate the plate body portion, the electrolyte including nickel ions and ferrous ions;
(3) The cathode and the anode are electrified after being connected with a power supply, the protective coating is dissolved into the electrolyte, scaling substances attached to the surface of the protective coating can fall into the electrolyte along with the dissolution of the protective coating, and metal simple substances are separated out from the flow guide electrode 2 and are nickel or iron.
Firstly, a plate type heat exchanger is used for treating some waste water which is easy to be difficult to be scaled, when the scaling of the heat exchanger plate 1 cannot be used, the electrode connecting part 12 on the heat exchanger plate 1 is connected with the positive electrode of a power supply to serve as an anode, and the nickel-iron alloy is connected with the negative electrode of the power supply to serve as a cathode to be put into an electrolytic tank for electrolysis.
In the electrolytic process, the nickel-iron metal coating on the surface of the heat exchanger plate 1 loses electrons to become nickel ions and ferrous ions which are continuously dissolved into the electrolyte, and the scaling substances attached to the coating can fall off into the electrolyte together with the nickel ions and ferrous ions. The nickel ions and ferrous ions in the electrolyte can obtain electrons to become nickel and iron, and then the nickel ions and the ferrous ions are separated out on the guide electrode 2 made of the nickel-iron alloy to supplement nickel and iron elements dissolved in the process of preparing the protective coating before, and the separated nickel and iron elements can be reused for preparing a new nickel-iron alloy coating, so that the effect of recycling is achieved.
In the actual cleaning process, more than 90% of the coating can be removed, and simultaneously, the scaling matters which cannot be cleaned on the surface layer of the heat exchanger can be removed. After the electrolytic cleaning is finished, the heat exchanger plate 1 is placed in oxalic acid solution for soaking, so that the nickel-iron alloy coating is completely removed, and scaling substances remained on the residual coating can also be completely removed, thereby realizing the purpose of thoroughly cleaning the scaling substances. The cleaned heat exchanger plate 1 can be a brand new heat exchanger plate substrate, the cleaned heat exchanger plate 1 can be used as a cathode again, the flow guide electrode 2 made of the nickel-iron alloy is used as an anode, the electroplating process is continuously repeated, and a nickel-iron alloy coating is electroplated on the cleaned heat exchanger plate 1. When the electroplating is completed, a brand new heat exchanger plate 1 with a protective coating can be obtained.
Example 5
The invention also provides an application method of the plate heat exchanger in the field of wastewater treatment, which comprises the following steps:
(1) A plate heat exchanger with titanium plates is taken, the titanium plates are taken as heat exchanger plate base materials, a layer of protection plating layer is electroplated on the surfaces of the heat exchanger plate base materials to form scale prevention plates, and the protection plating layer is a nickel-iron alloy plating layer or a pure nickel plating layer;
the electrode connection 12 to be connected with the battery electrode is welded to the titanium plate sheet in step (1) by an electric welding process to form the heat exchanger plate base material before plating. The battery connecting part can enable the titanium plate to be completely immersed in the plating solution during electroplating, so that the whole titanium plate is covered by the protective plating layer.
(2) Treating wastewater by using a plate heat exchanger with the scale preventing plate;
(3) When the scale forming substances are attached to the protective coating, the scale preventing plate is electrolyzed, the protective coating is dissolved in the electrolysis process, and the scale forming substances attached to the surface of the protective coating can fall along with the dissolution of the protective coating;
(4) And (3) taking the anti-scaling plate subjected to electrolysis in the step (3) as a new heat exchanger plate base material, electroplating a new protective coating on the surface of the new heat exchanger plate base material to form a new anti-scaling plate, and repeating the steps (2) - (4).
The electroplating process and the electrolysis process in the application method can respectively use the electroplating equipment and the electrolysis equipment in the prior art, and preferably, a set of electrolysis equipment can be used for completing the electroplating process and the electrolysis process in the application method.
The electrolysis equipment comprises a power supply, electrolyte, an electrolytic tank and a diversion electrode 2, wherein the diversion electrode 2 is made of nickel-iron alloy or pure nickel. The electrolyte can be used as a plating solution when the electroplating process is performed, and the electrolytic tank can be used as a plating tank when the electroplating process is performed. Specifically, in the electroplating process in the step (1), the heat exchanger plate substrate is used as a cathode, and the diversion electrode 2 is used as an anode; the electrolytic process in the step (3) takes the scale preventing plate as an anode and the diversion electrode 2 as a cathode. And placing cathodes and anodes with different connection modes into an electrolytic tank filled with electrolyte, and electrifying to realize two processes with corresponding connection modes.
When treating some raw water with high hardness, high silicon ion and high iron ion content, the scaling matters of the heat exchanger plate 1 can not be thoroughly cleaned all the time, the scaling rate in the subsequent evaporation process can be faster, the scaling layer can be gradually thickened along with the increase of the service time of the heat exchanger, the heat exchange efficiency of the heat exchanger plate 1 can be seriously affected when the scaling layer is thick to a certain extent, the energy consumption of the heat exchanger can be further improved, the actual evaporation amount of the heat exchanger can be greatly reduced due to the serious reduction of the heat exchange efficiency, and therefore, the new heat exchanger plate 1 needs to be replaced in half a year to 1 year so as to ensure that the design yield is achieved.
The application method can utilize the principle of electrolysis to wash away scaling matters, so that the heat exchange efficiency of the plate is not affected, and the plating film and the washing are a cyclic reciprocating process, so that the service life of the plate is effectively prolonged. The new heat exchanger plate 1 is replaced approximately 3-5 years old, and the service life of the heat exchanger plate 1 is greatly prolonged.
Compared with the prior art, the plate heat exchanger provided by the invention has the advantages that the nickel-iron alloy coating is electroplated on the titanium plate, and serves as a protective layer, so that the excellent heat conduction performance of the plate is maintained, the corrosion resistance of the plate is improved, the plate can be used as a completely removable buffer layer for isolating the contact between the plate and the scale matters difficult to clean, the scale matters attached to the nickel-iron alloy coating can be removed together by only electrolyzing the nickel-iron alloy coating when the plate heat exchanger is required to be cleaned, and the scale matters cleaning efficiency is greatly improved.
The equipment used in the preparation method can be purchased directly, the cost is low, the expansion production is facilitated, the preparation equipment adopted in the preparation method can realize the cleaning function of the heat exchanger plate 1 only by exchanging the cathode and the anode, and scaling substances can be removed directly through the plating layer on the electrolytic heat exchanger plate 1, so that the preparation method is very convenient. The nickel and iron elements separated out in the electrolysis process can be reused for preparing a new nickel-iron alloy coating, so that the nickel-iron alloy coating has the effect of recycling and greatly saves the cost. The cleaned heat exchanger plate 1 can be used as a brand new heat exchanger plate base material to be applied to the preparation process, the cleaned heat exchanger plate 1 is used as a cathode again, the flow guide electrode 2 made of the nickel-iron alloy is used as an anode, the electroplating process is continuously repeated, and a nickel-iron alloy coating is electroplated on the cleaned heat exchanger plate 1. After the electroplating is finished, a brand new nickel-iron alloy plated heat exchanger plate 1 can be obtained, and the service life of the heat exchanger plate 1 is greatly prolonged.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that modifications and improvements can be made by those skilled in the art without departing from the spirit of the invention, and the invention is intended to encompass such modifications and improvements.
Claims (9)
1. A plate heat exchanger plate, characterized in that: the heat exchanger plate comprises a heat exchanger plate substrate and a protective coating, wherein the heat exchanger plate substrate comprises a plate body and an electrode connecting part which is arranged on the plate body and is used for being connected with a power electrode; the protective coating is electroplated on the surface of the plate body, the protective coating can remove the self and the scaling matters attached to the protective coating through electrolysis and can be repeatedly arranged through electroplating, the protective coating is a nickel-iron alloy coating or a pure nickel coating, and the thickness of the protective coating is 25-100 mu m.
2. A plate heat exchanger plate according to claim 1, wherein: the electrode connecting portion and the plate body are integrally formed.
3. A plate heat exchanger plate according to claim 2, wherein: the mass ratio of the nickel material to the iron material of the nickel-iron alloy plating layer is (7-8) 1.
4. A plate heat exchanger, characterized by comprising a plate heat exchanger plate according to any one of claims 1-3.
5. A method for manufacturing a plate heat exchanger plate according to any one of claims 1-3, characterized in that it comprises the steps of:
(1) Pressing the heat exchanger plate base material on a titanium plate by using an integral forming process or welding the electrode connecting part on the plate body to form the heat exchanger plate base material;
(2) Placing the heat exchanger plate substrate prepared in the step (1) into a plating tank as a cathode, and placing a flow guide electrode into the plating tank as an anode, wherein the flow guide electrode is made of nickel-iron alloy or pure nickel;
(3) Pouring an electroplating solution into a plating tank and enabling the electroplating solution to permeate through the plate body, wherein the electroplating solution is a sulfate-chloride mixed type electroplating solution containing a stabilizer, and the pH value of the electroplating solution is 3-4;
(4) And connecting the cathode and the anode with a power supply, and then electrifying, wherein a layer of protection coating is formed on the plate body.
6. A method for cleaning a plate heat exchanger plate according to any one of claims 1-3, characterized by the steps of:
(1) Placing a used plate type heat exchanger plate as an anode into an electrolytic tank, attaching scaling substances on a protective coating on the surface of the plate, and placing a flow guiding electrode as a cathode into the electrolytic tank, wherein the flow guiding electrode is made of nickel-iron alloy or pure nickel;
(2) Pouring an electrolyte into the electrolytic cell and causing the electrolyte to permeate the plate body portion, the electrolyte including nickel ions and ferrous ions;
(3) The cathode and the anode are electrified after being connected with a power supply, the protective coating is dissolved into the electrolyte, the scaling matters fall into the electrolyte along with the dissolution of the protective coating, and the metal simple substance is precipitated on the flow guide electrode and is nickel or iron.
7. The application method of the plate heat exchanger in the field of wastewater treatment is characterized by comprising the following steps of:
(1) A plate heat exchanger with titanium plates is taken, the titanium plates are taken as heat exchanger plate base materials, a layer of protection plating layer is electroplated on the surfaces of the heat exchanger plate base materials to form scale prevention plates, and the protection plating layer is a nickel-iron alloy plating layer or a pure nickel plating layer;
(2) Treating wastewater by using a plate heat exchanger with the scale preventing plate;
(3) When the scale forming substances are attached to the protective coating, the scale preventing plate is electrolyzed, the protective coating is dissolved in the electrolysis process, and the scale forming substances attached to the surface of the protective coating can fall along with the dissolution of the protective coating;
(4) Taking the anti-scaling plate sheet subjected to electrolysis in the step (3) as a new heat exchanger plate sheet base material, and electroplating a new protective coating layer on the surface of the anti-scaling plate sheet to form a new anti-scaling plate sheet;
(5) Repeating the steps (2) - (4).
8. The application method according to claim 7, wherein: the titanium plate comprises a plate body and an electrode connecting part arranged on the plate body and used for being connected with a power electrode, and the titanium plate is pressed by an integral molding process or is formed by welding the electrode connecting part on the plate body by electric welding.
9. The application method according to claim 8, wherein: in the electroplating process in the step (1), the heat exchanger plate base material is used as a cathode, the flow guide electrode is used as an anode, and the flow guide electrode is made of nickel-iron alloy or pure nickel;
and (3) in the electrolysis process in the step (3), the scale preventing plate is used as an anode, and the diversion electrode after the step (1) is used as a cathode.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5788824A (en) * | 1996-04-12 | 1998-08-04 | Usinor Sacilor (Societe Anonyme) | Process for conditioning the copper or copper-alloy external surface of an element of a mold for the continuous casting of metals, of the type including a nickel plating step and a nickel removal step |
| CN2932283Y (en) * | 2006-07-10 | 2007-08-08 | 吴浩 | Plate-type heat exchanger anticorrosive metal-based laminated synthetic plate |
| CN102798306A (en) * | 2011-05-23 | 2012-11-28 | 哈尔滨工大金涛科技股份有限公司 | Bending plate type sewage heat exchanger |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE527509C2 (en) * | 2003-10-17 | 2006-03-28 | Alfa Laval Corp Ab | Soldered plate heat exchanger with plates of substantially stainless steel and process for manufacturing such plate heat exchanger |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5788824A (en) * | 1996-04-12 | 1998-08-04 | Usinor Sacilor (Societe Anonyme) | Process for conditioning the copper or copper-alloy external surface of an element of a mold for the continuous casting of metals, of the type including a nickel plating step and a nickel removal step |
| CN2932283Y (en) * | 2006-07-10 | 2007-08-08 | 吴浩 | Plate-type heat exchanger anticorrosive metal-based laminated synthetic plate |
| CN102798306A (en) * | 2011-05-23 | 2012-11-28 | 哈尔滨工大金涛科技股份有限公司 | Bending plate type sewage heat exchanger |
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